Fernandes, J. F. P.; Branco, P. J. C, “The Shell-Like Spherical Induction Motor for Low-Speed Traction: Electromagnetic Design, Analysis, and Experimental Tests,” IEEE Transactions on Industrial Electronics, 63 (7), 4325- 4335, 2016.

Bhatia, A.; Kumagai, M.; Hollis, R, “Six-stator spherical induction motor for balancing mobile robots,” IEEE International Conference on Robotics and Automation (ICRA), 226- 231, 2015.

Kumagai, M.; Hollis, R. L, “Development and control of a three DOF spherical induction motor,” IEEE International Conference on Robotics and Automation, 1528-1533, 2013.

Park, J.; Kim, M.; Jang, H. G.; Jung, D. Y.; Park, J. M, “Design and control of a permanent magnet spherical wheel motor,” ETRI Journal, 41 (6), 838-849, 2019.

S. H. Kim, “Electric Motor Control, DC, AC, and BLDC motors,” Elsevier Inc., 2017.

S. K. Sul, “Control of Electric Machine Drive Systems,” Wiley Inc, 2011.

Krause, P. C.; et al. “Analysis of Electric Machinery and Drive System,” 2nd ed.; Wiley-Interscience: New York, 2002.

S. Dutta, T. K. Maiti, M. Miura-Mattausch, Y. Ochi, N. Yorinoand H. J. Mattausch, “Analysis of Sensor-Based Real-Time Balancing of Humanoid Robots on Inclined Surfaces,” in IEEE Access, vol. 8, pp. 212327-212338, 2020.

J. A. Riul, A. G. Costa Junior and P. H. Miranda Montenegro, “Nonlinear Neural Model of a Robot Five Degrees of Freedom,” in IEEE Latin America Transactions, vol. 14, no. 4, pp. 1652-1655, April 2016.